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a) b)
c) d)
FIGURE 7. a) Slice of diffusion weighted data for one (arbitrarily selected) gradient
direction. b) Same diffusion weighted data after POAS as proposed in
this paper. c) Same slice shown after averaging over four subsequent measurements
(same as Fig. 1). d) Smoothed averaged data set.
quality of the smoothed result based on a single measurement compares well with the repeated
data, which required a four times longer acquisition time.
In Figure 7 slices of an (arbitrarily selected) diffusion weighted image Sg are shown (same as
Figure 1), together with the results after smoothing. Furthermore, we show the comparison of
the diffusion weighted image for the averaged data set with and without smoothing.
Finally, in Figure 8, we provide fiber tracking results using a simple streamline algorithm [Mori
et al., 1999, Xue et al., 1999] with FA < 0.266 as stopping rule and a maximum angle of 45
degrees between the line segments. Figure 8(a-d) show only fibers through a region-of-interest
within the corpus callosum, while Figure 8(e-h) provides the results for the whole brain. Noise
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